In data societies, as everyday activities are mediated by digital technologies, individuals are thrown into a digital existence, even if they are not aware of their digital interactions. Digital technologies are not value-free or unbiased. Contemporary discourses about digital natives and late adopters contribute to reinforcing negative stereotypes about older users of digital technologies and influence the design, development, marketing and usage of digital technologies. Such discourses disregard how digital trajectories and personal circumstances influence media use in all stages of everyday life. Hence, occasional digital technology users, and older adults in particular, stand a higher risk of exclusion and loss of autonomy. In this chapter, we briefly introduce ageism and digital ageism in data societies, definitions and previous research as a background and introduction to the following chapters. Our aim is to underline how socio-technical and cultural analyses may contribute to raising awareness about digital ageism in data societies. Only by initiating a discussion may existing power relationships be challenged and contemporary inequalities understood.